Nick Kyrgios: Watch the moment he tells Stan Wawrinka that Thanasi Kokkinakis 'banged' his girlfriend

Australian likely to face action from ATP

Nick Kyrgios (GETTY IMAGES)

Nick Kyrgios has become embroiled in yet more controversy by sledging Stan Wawrinka during a match, informing the Swiss star that a fellow professional had slept with his girlfriend.

Midway through the second set of their contest at the Montreal Masters, Kyrgios alleged that teenage Australian player Thanasi Kokkinakis had slept with the French Open champion's partner.

"Kokkinakis banged your girlfriend," he said. "Sorry to tell you that, mate".

The Australian tennis player's trash talking was picked up by a court-side microphone at the hard court event, which is one of the major tournaments in the build up to the US Open.

Watch the incident below...

Stan Wawrinka at the Montreal Masters (GETTY IMAGES)

It's likely that Kyrgios will face action from the ATP, particularly after Wawrinka took to Twitter after the match urging them to do so.

"So disappointing to see a fellow athlete and colleague be so disrespectful in a way I could never even imagine.

"What was said I wouldn't say to my worst enemy.

"To stop [sic] so low is not only unacceptable but also beyond belief.

"There is no need for this kind of behaviour on or off the court and I hope the governing body of this sport does not stand... for this and stands up for the integrity of this sport that we have worked so hard to build."

Wawrinka progressed in the tournament after Kyrgios retired despite leading 6-7, 6-3, 4-0.